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Microchip Technology MCP1811BT-028/LB
- Part No.:
- MCP1811BT-028/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811BT-028/LB.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,486
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Product details
Overview
MCP1811BT-028/LB from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 2.8 V output, designed for energy-constrained battery-powered systems. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features 5 nA typical shutdown current - making it ideal for wearable electronics and medical devices requiring multi-year battery life.
For engineers reviewing the MCP1811BT-028/LB datasheet, MCP1811BT-028/LB pinout, MCP1811BT-028/LB application, or MCP1811BT-028/LB equivalent, key selection criteria include its 2.8 V fixed output, 400 mV dropout at 150 mA, thermal performance in the 3-lead SOT-23 package, and compatibility with micro-power MCU sleep modes.
Technical Context
The MCP1811BT-028/LB implements a PMOS pass transistor architecture enabling ultra-low IQ operation and near-zero load-dependent ground current variation. Its internal error amplifier maintains ±4% output voltage accuracy over -40°C to +85°C junction temperature while rejecting supply ripple up to -50 dB at 1 kHz without input capacitance.
It integrates foldback current limiting (50 mA at 1 Ω load), overcurrent protection, and a dedicated SHDN control pin that enables fast turn-on (400 µs delay) and output discharge only in A-variant parts - but the B-variant (including MCP1811BT-028/LB) omits discharge functionality to minimize leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures stable bias for 2.8 V logic rails and analog sensors without external feedback. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications using coin cells. |
| Shutdown Current | 5 nA typical - reduces system standby power to negligible levels during deep-sleep MCU states. |
| Max Output Current | 150 mA - sufficient to power BLE SoCs, low-power displays, or sensor signal chains concurrently. |
| Dropout Voltage | 400 mV @ 150 mA - allows regulation from 3.2 V input down to end-of-life battery voltages (e.g., 3.0 V alkaline). |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic caps, reducing board area and cost. |
| PSRR | -50 dB @ 1 kHz - suppresses switching noise from adjacent DC/DC converters without additional filtering. |
Pinout & Package
Package: 3-Lead SOT-23 (TO-236). Compact footprint (2.92 mm × 1.3 mm × 1.0 mm) with exposed pad option not present in this variant; thermal resistance θJA = 211.33°C/W on JEDEC 4-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled locally with ≥1 µF ceramic cap to ensure stability and PSRR performance. |
| VOUT | Regulated output | Delivers fixed 2.8 V; requires ≥1.0 µF ceramic output capacitor tied directly to GND for loop stability. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; connect to quiet analog ground plane near output cap. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical draw enables >10-year runtime on CR2032 (220 mAh) powering 10 µA average loads. |
| 5 nA shutdown mode | Reduces system standby power to sub-nW level - critical for energy harvesting and wake-on-event architectures. |
| Ceramic-capacitor stability | 1.0 µF X7R ceramic suffices for full-load stability, eliminating ESR sensitivity and aging concerns of electrolytics. |
| Wide input range | 1.8–5.5 V operation supports single-cell Li-ion, LiFePO₄, alkaline, and NiMH sources without pre-regulation. |
| Thermal protection | Internal thermal shutdown activates above +125°C junction temperature, preventing damage during sustained overload. |
Applications
| Wearable Health Monitors | Smart Card Readers |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn patches powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 2.8 V power rail for analog front-end and BLE radio during active measurement and sleep cycles. Use Value: 250 nA quiescent current extends battery life beyond 3 years; 150 mA peak supports concurrent sensor excitation and wireless transmission. | Use Scenario: Contactless smart card reader in portable POS terminals powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Supplies regulated 2.8 V to NFC controller IC and secure element during RF field generation and data exchange. Use Value: 400 mV dropout enables operation down to 3.2 V battery voltage, preserving usable capacity through full discharge cycle. |
| Hearing Aid Processors | Energy-Harvesting Sensors |
Use Scenario: Miniaturized digital hearing aid with DSP, microphone preamp, and receiver driver. IC Role / Device Role / Timing Role: Main LDO delivering clean 2.8 V to ultra-low-power DSP core and audio codecs during voice processing. Use Value: -50 dB PSRR at 1 kHz rejects switching noise from boost converters used for receiver bias, ensuring SNR > 90 dB. | Use Scenario: Wireless environmental sensor node powered by solar harvester with supercapacitor buffer. IC Role / Device Role / Timing Role: Regulates variable harvester output (2.0–5.0 V) to stable 2.8 V for MCU and RF transceiver during intermittent wake-up bursts. Use Value: 1.8 V minimum input allows startup from partially charged supercapacitors; 5 nA shutdown minimizes leakage loss between harvest events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-028/LB | Includes output discharge transistor (RDCH ≈ 100 Ω); 10 nA shutdown current vs. 5 nA. | Required where rapid VOUT discharge on shutdown prevents unintended wake-up or latch-up in downstream circuitry. | Select when system-level safety mandates controlled output collapse during disable; otherwise MCP1811BT-028/LB offers lower leakage. |
| Torex XC6210B282MR-G | 250 nA IQ, 200 mA output, 300 mV dropout @ 100 mA; SOT-23-3 package; no shutdown pin. | Suitable for always-on, non-shutdown applications where higher current headroom is needed but enable control is unnecessary. | Choose when higher output current margin is required and system lacks a dedicated SHDN control signal. |
Compared with MCP1811AT-028/LB, the MCP1811BT-028/LB trades output discharge capability for 2× lower shutdown current - optimizing for longest possible battery life in intermittently active systems. Against XC6210B282MR-G, it provides active enable control and tighter dropout at full load, at the cost of slightly lower max current.
Availability
MCP1811BT-028/LB is available at Aetrix Electronics and suitable for wearable electronics, medical devices, and energy-harvesting sensors requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1811BT-028/LB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a leading provider of microcontrollers, analog components, and timing solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP1811/12 family targets ultra-low-power battery-operated systems, emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust performance across wide temperature and load ranges.
FAQ
What is the output voltage tolerance of the MCP1811BT-028/LB over temperature and load?
The MCP1811BT-028/LB delivers 2.8 V output with ±4% tolerance across -40°C to +85°C junction temperature and 0–150 mA load range. This specification holds under standard test conditions (VIN = VR + 1 V, CIN = COUT = 1 µF ceramic), ensuring reliable operation in portable medical and wearable environments where ambient temperature varies widely.
Does the MCP1811BT-028/LB require an input capacitor?
The MCP1811BT-028/LB does not mandate an input capacitor for stability, but Microchip recommends a 1 µF ceramic capacitor placed close to the VIN pin to improve PSRR and transient response. Without it, PSRR degrades significantly - especially above 100 Hz - potentially allowing noise coupling into sensitive analog circuits powered by the MCP1811BT-028/LB.
Can the MCP1811BT-028/LB be used with a 1.5 V input source?
No, the MCP1811BT-028/LB requires a minimum input voltage of 1.8 V per its absolute specifications. At 1.5 V input, the device will not regulate - output collapses to approximately VIN minus pass transistor threshold drop. For sub-1.8 V operation, consider Microchip's MCP1700 series or alternative nanoscale LDOs rated for lower VIN.
How does the shutdown pin (SHDN) function on the MCP1811BT-028/LB?
The SHDN pin on the MCP1811BT-028/LB is active-high: applying ≥70% of VIN enables regulation; pulling to GND disables output and reduces supply current to 5 nA typical. The pin exhibits ≤0.5 nA leakage at 5.5 V, ensuring minimal impact on high-impedance enable networks. No external pull-up is required if driven actively.
Is the MCP1811BT-028/LB compatible with MLCCs having DC bias derating?
Yes - the MCP1811BT-028/LB is characterized and guaranteed stable with 1.0 µF X7R ceramic capacitors, including those exhibiting DC bias derating. Microchip's validation accounts for typical 20–30% capacitance loss at rated voltage; design margin ensures loop stability even when effective COUT drops to ~0.7 µF under bias, eliminating need for oversized or high-voltage-rated MLCCs.
MCP1811BT-028/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 110 µA
- PSRR:
- 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MCP1811BT-028/LB FAQ
1.How can I place an order for MCP1811BT-028/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-028/LB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP1811BT-028/LB reliable?
The price and inventory of MCP1811BT-028/LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-028/LB is usually 5 days.
3.What payment methods are accepted for MCP1811BT-028/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-028/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-028/LB?
MCP1811BT-028/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-028/LB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP1811BT-028/LB?
For technical support, including MCP1811BT-028/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-028/LB requirements.
6.How does Aetrix verify that MCP1811BT-028/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-028/LB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP1811BT-028/LB meets industry standards.
7.What is the process for return or replacement of MCP1811BT-028/LB?
All MCP1811BT-028/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-028/LB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP1811BT-028/LB part is unused and in its original packaging.
Return procedure for MCP1811BT-028/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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